java telnet socket:BufferedReader / BufferedWriter [英] java telnet socket : BufferedReader / BufferedWriter
问题描述
我的服务器在23999打开一个telnet端口,当我给 telnet localhost 23999
时,它显示如下:
My server opens a telnet port on 23999 and when I give telnet localhost 23999
, it shows below :
< BP-SAS ==> bplin19 !>telnet 0 23999
Trying 0.0.0.0...
Connected to 0.
Escape character is '^]'.
Please enter password to authenticate:
(here i give password for example abc123)
Enter 'help' at any point to get a listing of all registered commands...
BAS> log set-info 1 ( commad i have entered and it does somthing )
现在不是像这样打开,我必须编写做这件事的java代码。
Now Instead of open like this, I have to write java code which does this thing.
- 连接到主机23999端口
- 输入密码
- 输入commad
Socket soc=new Socket("192.168.9.7",23999);
while(true){
//create buffered writer
BufferedReader bwin = new BufferedReader(new InputStreamReader(soc.getInputStream()));
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(soc.getOutputStream()));
BufferedWriter bw1 = new BufferedWriter(new OutputStreamWriter(soc.getOutputStream()));
String readFir = bwin.readLine();
System.out.println(readFir);
if(readFir.startsWith("Please")){
System.out.println("Password Entered");
bw.write("abc123");
bw.flush();
bw.close(); //close buffered Reader
}
readFir = bwin.readLine();
if(readFir.startsWith("Enter")){
System.out.println("Enter command");
bw1.write("log set-info 1");
bw1.flush();
bw1.close(); //close buffered Reader
}
//readFir = bwin.readLine();
}
这不起作用。实际上,我有点困惑我应该遵循什么方法。读者/作者之间非常混淆。
This is not working.Actually, I am bit confused what approach I should follow.Very much confused between reader/writer.
请帮忙。
推荐答案
只需要获取套接字输入流和输出流一次(在while循环外执行此操作)。尝试这样的事情:
Only need to get socket input stream and output stream once (do this outside the while loop). Try something like this:
Socket soc = new Socket("192.168.9.7",23999);
//create buffered writer
BufferedReader bwin = new BufferedReader(new InputStreamReader(soc.getInputStream()));
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(soc.getOutputStream()));
while (true) {
String readFir = bwin.readLine();
if (readFir == nul) break;
System.out.println(readFir);
if(readFir.startsWith("Please")){
System.out.println("Password Entered");
bw.write("abc123");
bw.newLine();
// instead might have to explicitly write "\r\n"
// depending platform you're connecting from.
bw.flush();
}
else if(readFir.startsWith("Enter")){
System.out.println("Enter command");
bw.write("log set-info 1");
bw.newLine();
bw.flush();
bw.close(); //close buffered Writer
break;
} else System.out.println("Skip: " + readFir);
}
要访问Telnet协议,最好使用像 Apache Commons Net 而不是自己动手。
For accessing Telnet protocol you might be better off using a library such as Apache Commons Net rather than do it yourself.
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